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In this paper, we review the background and state-of-the-art of big data. We first introduce the general background of big data and review related technologies, such as could computing, Internet of Things, data centers, and Hadoop. We then focus on the four phases of the value chain of big data, i.e., data generation, data acquisition, data storage, and(More)
In this paper, we address the problem of real-time video streaming over a bandwidth and energy constrained wireless sensor network (WSN) from a small number of dispersed video-sensor nodes (VNs) to a sink by combining forward error correction (FEC) coding with a novel multipath rouing scheme called directional geographical routing (DGR). DGR constructs an(More)
Enabling video transport over ad hoc networks is more challenging than over other wireless networks. The wireless links in an ad hoc network are highly error prone and can go down frequently because of node mobility, interference, channel fading, and the lack of infrastructure. However, the mesh topology of ad hoc networks implies that it is possible to(More)
Compared to conventional wireless sensor networks (WSNs) that are operated based on the client-server computing model, mobile agent (MA) systems provide new capabilities for energy-efficient data dissemination by flexibly planning its itinerary for facilitating agent based data collection and aggregation. It has been known that finding the optimal itinerary(More)
Transporting multimedia data over ad hoc networks is a challenging problem. However, the mesh topology of ad hoc networks implies the existence of multiple paths between two nodes. In our previous work, we have shown that path diversity provides an effective means of combating transmission errors and topology changes that are typical in ad hoc networks.(More)
The selection and design of performance metrics and utility functions is an important, but inadequately addressed issue in the design of cognitive radio networks. Unlike traditional radios, a cognitive radio may change its objectives as radio scenarios vary. Because of the dynamic pairing of objectives and contexts, it is imperative for cognitive radio(More)
Traditionally, routing is considered solely as a network layer problem and has been decoupled from application layer objectives. Although such an approach offers simplicity in the design of the protocol stack, it does not offer good performance for certain applications such as video. In this paper, we explore the problem of how to perform routing with the(More)
We consider the problem of multicasting multiple description (MD) video in wireless ad hoc networks. We follow an application-centric, cross-layer approach with the objective of minimizing video distortion. The contribution of this paper is twofold. First, we propose a practical MD video multicast scheme that uses multiple trees to achieve an improved error(More)
As developments in wireless ad hoc networks continue, there is an increasing expectation with regard to supporting content-rich multimedia communications (e.g., video) in such networks, in addition to simple data communications. The recent advances in multiple description (MD) video coding have made it highly suitable for multimedia applications in such(More)